<template>
  <el-upload
    class="avatar-uploader"
    action=""
    :show-file-list="false"
    :before-upload="beforeAvatarUpload"
  >
    <!-- (自动上传)action是上传地址 人资项目不需要 人资项目(手动上传)  -->
    <!-- show-file-list不展示列表 -->
    <img v-if="value" :src="value" class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon" />
  </el-upload>
</template>

<script>
export default {
    props: {
        value: {
            type: String,
            default: ''
        }
    },
    methods: {
    // 检查函数 判断文件的类型还有大小 return  true(继续上传)/false(停止上传)
        beforeAvatarUpload(file) {
            // jpeg png gif bmp

            const isJPG = ['image/jpeg', 'image/png', 'image/gif', 'image/bmp'].includes(file.type)
            const isLt2M = file.size / 1024 / 1024 < 5 // 5M

            if (!isJPG) {
                this.$message.error('上传头像图片只能是 JPG PNG GIF BMP 格式!')
            }
            if (!isLt2M) {
                this.$message.error('上传头像图片大小不能超过 5MB!')
            }
            return isJPG && isLt2M
        }
    }
}
</script>

<style>
  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }
  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }
  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }
  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }
</style>
